Bearing changing tool



June l5, 1954 w. PQTTER BEARING CHANGING Toor.

Filed Jan. 3, 1950 FIG, I.

lfgVENTOR.

011W odia) 4 mfww) HIS ATTORNEYS.

Patented June l5, 1954 BEARING CHANGING TOOL Wilfred C. Potter, Overl Wagner Electric Corpo corporation of Delaware Application January 3, 1950, Serial No. 136,481

2 Claims. l

This invention relates to a tool for removing and installing sleeve type bearings and bushings. 'I'he device is particularly adapted forl the removal and installation of steel backed babbitt lined sleeve bearings used in motor endplates. This type of bearing consists of a steel jacket having a thin inner surface of babbitt which is usually provided with a slit parallel to the longitudinal axis of the bearing. The bearing unit is machined to its proper inside and outside diameters prior to its installation. Thus, when inserted into the bearing housing of a motor endplate, no additional machining operations are required provided the installation is performed without allowing more than a negligible amount of deformation to the inner surface of the sleeve bearing. v

In the past the removal of worn steel backed babbitt lined sleeve bearings and the installation of new bearings presented a difficult problem to servicemen and users of electric motors due to the fact that a sleeve bearing of this type has little mechanical strength before it is properly mounted in the bearing housing of a motor endplate. The difficulty of quickly and correctly installing a new steel backed babbitt lined bearlng in the place of a worn sleeve bearing has greatly retarded the commercial acceptance of this type of sleeve bearing. Manydevices have been placed on the market as a remedy for this difficulty but none of these devices fulfilled all the requirements. Experience has shown that this bearing changing tool meets all the necessary requirements in servicingr a motor.

The principal object ofv this invention is to provide a tool that will combine the removal of the worn bearing and the installation of the new bearing into one operation.

Another object of this invention is to provide a tool that is capable of maintaining a given bearing surface during installation to eliminate subsequent machining operations.

Another object is to provide a tool that automatically aligns the new bearing during the installation.

Still another object is to provide a bearing tool that will properly locate the new bearing in the bearing housing.

This device comprises a shaft having an abutment thereon, said shaftsupportinga new sleeve bearing adapted to be placed in abutting relationship with a sleeve which is in abutting relationship with a worn sleeve bearing.

- The invention also consists in the parts and arrangements and in the combination of parts hereinafter described and claimed. i

In the accompanying drawings, which form and, Mo., ration, St. Louis, Mo., a

assignor to part of this specification and wherein like numerals refer to like parts wherever they occur:

Fig. 1 is a vertical cross-sectional view of my device in assembled relation with a motorendplate whose sleeve bearing is to be replaced,

Fig. 2 is a vertical cross-sectional view of my device in assembled relation with the motor endplate after the worn sleeve bearinghas been partially removed from the bore of the endplate, and

Fig. 3 is a vertical cross-sectional View of a modified form of this device in assembled-re-- lation with a motor endplateY afterA the worn sleeve bearing has been removed from and the new sleeve bearing has been inserted into the bore of the motor endplate.

In Fig. 1 the bearing changing tool I is shown assembled in the bore 2 of an endplate 3 having a worn sleeve bearingA 4 therein which is to be removed. The bearing changing tool I comprises a shaft 5 having a threaded surface 6 on one end thereof7 a bearing surface 1 on the other end thereof with a reduced surface 8 therebetween, a chamfer 9 being provided at the junction of the bearing surface I and the reduced surface 8. The reduced surface 3 has a smaller diameter than the bore diameter of the worn sleeve bearing d to be removed. The bearing surface i has ,a diameter which allows the new sleeve bearing I0 to t snugly thereon. A sleeve II is slideably mounted on the bearing surface 'I of the shaft 5 between the new sleeve bearing I 0 and the worny sleeve bearing 4. A spacer I2 fits circum ferentially over a portion of the threaded surface 6 of the shaft 5 between the end of thev endplate 3 and a wrench type nut- I3 on said threaded surface 6. Y

A collar I4 having holes I 5- therein Iis slid-V ably mounted on the bearing surface 1 of the shaft Si at the end opposite the threaded surface 6 and a pin I6 is dropped through the holes I5 in the collar I4 and a hole I7 in the shaft 5. The length of thesleeve I I .must be shorter than the length of the machined surface I8 in the bore 2 ofthe endplate 3. y

To remove the worn sleeve bearing 4 and in? stall a new sleeve bearing I0 in a single operation, the device hereinbefore described is assembled on an endplate 3 as shown in Fig. 1. To obtain this assembly, the collar I4 is'first fitted into place on the bearing surface 'I of the shaft 5 and is secured theretoby insertingV a pin I6 into the coinciding holes I5 and I7 in the'collar I4 and *the shaft 5, respectively. A predeter-` mined portion ofthe bearing surface 'I remains exposed.v The new sleeve bearing lil whichis tofbe installed 'has one of its ends cut square with bearing lil andthe Y I'is 'shown in Fig. 3.V

.i bearing vsurface Y7a ing rliland the worn its other end chamfered as shown and is also machined and bored to the exact desired finished outside and inside diameters. This new sleeve bearing I is placed over the bearing surface 'I of the shaft with its square cut end contacting the edge of the collar I4. The sleeve II is then placed over rthe bearing surface TI so that one end of said -sleeve I I contacts the chamfered end of the new sleeve bearing III. YThe length of the bearing surface 1 is such that a small portion thereof remains exposed after the col-lar I4, the new sleeve bearing IB, and the sleeve II have been placed thereover. :The threaded end of the shaft 5 is then inserted Vinto the Vbore 2 of the endplate 3 until the edge of sleeve II abuts against the worn sleeve bearing 4. The spacer I2 is then placed over the threaded surface 5 of the shaft E so that one end thereof 'abuts against the outside surface of the endplate 3. TireV wrench type nut I3 is lthen screwed onto the @threaded vsurface G until said wrench type nut 13 abuts 'against the edge Yof the spacer I2. Continued rotation of the wrench type nut I3 forces the shaft 5 to move rightwardly with respe'ctto the endp'late .5 andcauses the worn sleeve bearing 14 vto be 'displaced bythe sleeve I-I. This is'shown in YVl''lig."2.

Further rotation `of the wrench type nut I3 Y causes the shaft 5 to move further rightwardly whereupon the new 'sleeve bearing It begins to move into the position vacated by the worn sleeve bearing 4, said worn sleeve bearing 4 serving as -a `guide -for Athe alignment of the new sleeve bearing I0. rThe machined surface I8, being of a constant diameter, maybe of any des'ired length providedV it will `*properly house and Ilfhe newY support the new sleeve bearing' IQ. sleeve bearing Ill, being previously bored to the proper size, maintains thec'orrect inside diameter by virtue Vof its support from the 'bearing surface 7 of 'the shaft 5. Rotation of the wrench type nut f3 is prevented when the right edge of the fcollar I4 abuts againstthe shoulder extend- Y ing from the left Aedge 'of the machined surface f8. 'When contact is made between the collar i4 'and the above shoulder vthe new sleeve bearing 'I9 is automaticallylocated in the position vacated by the worn sleeve bearing 4 :in the endplate 3. Y

The shaft 5 may then "be removed 'by one of two methods, vdepending upon the vdesire of 'the user. -The -quick'est a vd easiest vmethod of removal is to'remove thepin 'i6 and the collar I4. The portionof thebearing `surface'l normally covered by the sleeve Il being slightly relieved to facilitate removal ofthe shaftjii, theV shaft 5 is "pulled 'rightwardly clear ofthe newV sleeve endplate "3 by grasping the wrench type nut 'I and pulling it rightwardly. The worn sleeve Y'bearingig by virtue of the re-l duced surface 8, maybe removed with ease: If it'isdesired to remove the bearingV changing tool Iby a leftward movement, the wrench' type nut I3 must be unscrewed from the threadedsurface 6 of 5the'shaft 5 thus allowing'the spacer lI'2,.the wornjsleeve bearing 4 and the sleeve Il to be re moved.

QA modified form of the bearing changing tool This.V modified vbearing changing tool Ia comprises a shaftY 5a having .an extended surface I9, an enlarged surface 20 with a shoulder 2| thereon, a bearingsurface '7.a .and a'reduced surfaceV 3a.. A sleeve I'I fits Aover the between the .newY sleeve bears'leevebearing 4. The-length -chamfered .end v'of 'the new sleeve 4 i of the bearing surface 'Ia is the same as the length of the bearing surface 1 to the right of the collar I4 shown in Fig. 1 and Fig. 2.

To remove the worn sleeve bearing 4 and install a new sleeve bearing I0 in a single operation with this modified bearing changing tool. la, the new sleeve `bearing Il) is first placed fon the bearing surface 'Ia of the shaft 5a with its square cut end contacting the shoulder 2I formed between the enlarged surface 20 and the bearing `surface f'lu. 'The sleeve Il, normally having an outside diameter slightly smaller than the outside diameter of the new sleeve bearing I0 and the worn sleeve bearing 4, is then placed over the bearing surface Ia with one end contacting the bearing I0 with a small .portion of the bearing surface 1a extending beyond the end of the sleeve Il. The right end of the shaft 5a is then inserted into the bore 2 of the =endpla`te '3. Aft-er the-exposed portion of the bearing surface '7a `enters the worn sleeve bearing 4 the force of a hammer or of Aan arbor press may be lapplied to the left end 'of the 'shaft 5a moving Vthe shaft 5a rightwardly to the position show-n in Fig. 3 thereby replacing the worn sleeve lbearing -4 with thenew sleeve bearing lo in one operation. Duringthis operation the bearing surface "Ia, supports thefworn sleeve bearing 4 and aligns the newsleeve 'bearing I0.

The Worn may then 'be removed. IRemoval of the worn sleevebearing l4 is made Leasier'be'cause' of the reduced surface 8a. The shaft '5a removed'by lightly tapping :the right end thereof.

What I claim is:

Y l.' A bearing changing tool adapted Vto remove a worn sleeve bearing "fromfthebore of a motor endplate and install a neiifsleevelbearing there-V tween, said reduced .portion vbeing cylindrical fand Y in, said tool-comprising fa shaft Lhaving ian enlarged cylindrical portion Vthereon at one Vend thereof, a reduced portion at the 'other end there-` of with 'a cylindrical bearing .surface therebedf smaller diameter than the `cylindrical bearing surface, a shoulder provided 'at .the junction of saidenlarged cylindrical portion and 'said bearing surface and a charnfer provided on said bearing surface at .the junction of said bearing surface and said lreduced surface, said new sleeve bearing being supported on Vsaid bearing surface andin abutting relation tor 'said shoulder, .said shoulder having a portion which .extendsY radially Youtwardly beyond the outside `diameter of said nnew sleeve bearing, and a sleeve -slidably mounted on said bearing surface 'in abutting 'relation to rsaid new and Worn sleeve'bearings, said sleeve having an outside diameter less than 'the outside diameters of the sleeve bearings.Y

`2. A bearing changing tool according to clairnv 1,.wherein the combined lengths of the'newbearing and said sleeve are less than Y.the length of the bearing surface whereby to Yprovide a terminal portion of the bearing surface for entranceinto the Worn bearing.

References citen in the nie v:or .this :patent UNITED 'sfrfvrnsY PATENTS Number y sleeverb'earing 4and the sleeve "Il:

vcan 'then be. 

